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US Patent: 3,015,212
Pump Control
Patentees: Frederick G. Krafft (exact or similar names) - Springfield, Clark County, OH Walter Ernst (exact or similar names) - Dayton, Montgomery County, OH USPTO Classifications: 418/26, 60/450 Tool Categories: metalworking machines : metalworking machine mechanisms : hydraulic apparatus Assignees: Thompson Grinder Co. - Springfield, Clark County, OH Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Jun. 26, 1957 Granted: Jan. 02, 1962 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Thompson Grinder Co.
Description: Original application, 26 Jun 1957, now patent #2,921,439. Divided and this application, 31 Dec 1959.

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